Item Name: Glow Plug For 4c Engines For 5%-40% Nitro Fuels Improves Idle Speed and Transition Plus Item Model: N3 Size: 1.8 x 1.8 x 0.9cm Material: Metal Color: Silver Package Contents: 6 x Glow Plug 6 x Gasket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.